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Effects of structural features of cotton cellulose on enzymatic hydrolysis
Author(s) -
Focher B.,
Marzetti A.,
Cattaneo M.,
Beltrame P. L.,
Carniti P.
Publication year - 1981
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1981.070260622
Subject(s) - cellulose , enzymatic hydrolysis , hydrolysis , polymer science , enzyme , chemistry , materials science , pulp and paper industry , organic chemistry , polymer chemistry , engineering
Textile cotton wastes were treated with γ rays and 18% NaOH and 70% ZnCl 2 solutions and were subjected to enzymatic hydrolysis. The untreated and treated samples were characterized both before and after hydrolysis by means of parameters concerning molecular structure (degree of polymerization), supermolecular structure (x‐ray diffraction), accessibility, and reactivity (moisture regain, enzyme adsorption, and solubility in FeTNa). These parameters were correlated to kinetic parameters of the hydrolysis reaction. The V max and K m values were evaluated from Lineweaver–Burk plots at different temperatures. The V max / K m ratio, analogous to the specificity constant, proved to be less sensitive to experimental errors and more suitable for a comparison of the kinetic behavior of the samples. The modifications of both supermolecular structure and morphology of cellulose were of primary importance to attain high yields and rates of hydrolysis. Furthermore, the structural and morphologic parameters chosen to characterize the samples can be correlated to the kinetic parameters of enzymatic hydrolysis, in particular to K m values.